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Accounting Policies (Policies)	3 Months Ended
Accounting Policies (Policies)	Mar. 31, 2024
Accounting Policies [Abstract]
Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block]	BASIS OF PRESENTATION AND PRINCIPLES OF CONSOLIDATION The consolidated financial statements include the accounts of Regions, its subsidiaries and certain VIEs. See Note 1 in Regions’ Annual Report on Form 10-K for the year ended December 31, 2023 for additional information about consolidation principals surrounding VIEs. On January 1, 2024, the Company adopted new accounting guidance that allows entities to elect to account for qualifying tax credit investments using the proportional amortization method, on a tax-credit program by tax-credit program basis, if certain conditions are met. Regions adopted the guidance under the modified-retrospective transition approach, with an immaterial cumulative impact recorded to retained earnings. Previously, Regions recognized equity investments in economic development projects at cost, with periodic adjustments for impairment, and applied proportional amortization to investments in affordable housing projects in accordance with other guidance. Refer to Note 2 for additional disclosures.